What is FADEC mode?

Full Authority Digital Engine Control (FADEC) means just that. There is no direct pilot control over the engine or manual control mode. If the FADEC fails, the engine fails. However, system redundancy makes it much less likely for a FADEC system to fail than a traditional magneto system.

What happens when FADEC fails?

If a total FADEC failure occurs, the engine fails. Upon total FADEC failure, pilots have no manual controls for engine restart, throttle, or other functions.

How is the FADEC powered on the a320?

The FADEC is powered by a dedicated Permanent Magnet Alternator (PMA) on the engine gearbox.

When was FADEC invented?

FADEC 1. Introduced in 1988, the evolution of our full authority digital engine controls began with the development of the FADEC 1 – designed to accommodate multiple Boeing and Airbus commercial platforms.

How does a fuel control unit work?

The fuel control unit (FCU) uses a speed governor to adjust the shaft speed to the value demanded by the input of the power lever. For the calculation of the fuel flow the FCU follows the fuel demand function of the specific engine.

What is engine EEC MODE?

The EEC calculates and controls the required thrust N1 by means of the total ambient pressure (PT) input from the ADIRU, or calculates this with the total air temperature (TAT) and the ambient static pressure (P0). The EEC calculates the Mach number reference to the N1 speed requirement for the selected thrust setting.

Which controls the power supply to the APU EEC unit?

Power for the EEC comes from the aircraft electrical system or the permanent magnet alternator (PMA). When the engine is running, the PMA supplies power to the EEC directly. The EEC is a two channel computer that controls every aspect of engine operation.

Who invented FADEC?

Pratt and Whitney
In the 1970s, NASA and Pratt and Whitney experimented with their first experimental FADEC, first flown on an F-111 fitted with a highly modified Pratt & Whitney TF30 left engine.

What are the two modes of operation of EEC?

The EEC can control the engine thrust in two modes, which can be selected by use of a mode selection switch. In the normal mode, engine thrust is set with EPR; in the alternate mode, thrust is set by N1.

What is HMU in FADEC?

The HMU contains the fuel metering valve that controls the fuel sent to the combustor, and other control valves that operate the variable stator vanes, variable intercompressor bleed valve, turbine active-clearance-control system, and fuel-nozzle staging.

How does the APU start?

The APU can be started utilizing only the aircraft battery(s) and, once running, will provide electrical power to aircraft systems as well as bleed air for air conditioning and for engine start.

How does a fuel regulator work?

When the pressure inside the bottom chamber of the FPR exerts a high enough force on the valve. It overcomes the spring force and lift’s the valve off its seat. This allows fuel to flow through the outlet port effectively controlling the fuel pressure in the fuel rail.

How does a fuel metering unit work?

The FMU meters a precise amount of fuel fed into engine combustors, and dynamically alters the position of various valves to either increase or decrease the flow of fuel based on demand.